A/T - Delayed Engagement In Drive/Reverse

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Number: 92-67-7A

Section: 7A

Date: DEC. 1991

Corporate Bulletin No.: 107105R

ASE No.: A2


Subject: DELAYED ENGAGEMENT IN DRIVE/REVERSE


Model and Year: 1991-92 LUMINA AND LUMINA (APV) WITH 4T60/4T60E AUTOMATIC TRANSMISSION


The above condition could be caused by a rolled or cut input clutch piston outer seal. The initial comment is often a delay in drive cold. The condition will sometimes develop into a no/delay drive or reverse cold and delay hot over a 2000-5000 mile range. If this condition is encountered, it is recommended that the input clutch piston outer seal be replaced.

NOTE: An air check of the piston as a diagnostic aid could be misleading.

Refer to the service manual diagnostic section for other causes of delayed engagement. GM Powertrain is currently performing a root cause analysis on this condition.